There’s one thing that has stuck with me for more than a decade (probably). It was a very short youtube video. It was just a man and women in bed back to back. After a second it pans to the woman’s side of the bed and shes a scary looking monster demon lady. I think about it once or twice a week. Specifically when laying in bed with my lady and shes not facing me.I have no idea what its from. Youtube used to have alot of randomly terrifying content.
Creepiest is definitely SCP articles
I love SCP related stuff but I haven’t been on the site in probably a decade.
An extended story that I recently read (or rather, listened to) was “There is no Antiemetics Division”, by qntm. The channel J&V SCP archives have an excellent audiobook-style reading of it, if that’s your thing. It’s not especially scary (though it does have its moments), but stumbling across it really reignited my enjoyment of SCP.